Sir CHARLES NAPIER--(there are three Napiers, all equally ready with the sword and pen, and with the Bishop of Exeter probably the four most impracticable and crotchety men now alive: William, major-general, author of the "Peninsular War," "Conquest of Scinde," and other works; Charles J., major-general, commander-in-chief in India, author of the oddest dispatches and general-orders on record; and Charles, rear-admiral, and author of the pamphlet of which we are about to speak)--has issued a publication in which all the horrors which Sir Francis Head foresees in a French invasion and conquest of England are abundantly magnified. The admiral proves, to his own satisfaction at least, that England is at any moment liable to fall a prey to French, Russian, or American rapacity. A life of EDWARD WILLIAMS, a Welsh poet of the last century, has just been published in London, which is said to contain a good deal of pleasant literary gossip. We find mentioned in it a rencontre with the great Dr. Johnson, which is characteristic, and interesting enough to be repeated. Mr. Williams seems to have been fond of lounging in book stores, and on one such occasion was thus occupying a leisure hour, and quiet corner, in this banqueting-room, "when a large, ungraceful man entered the shop, and seating himself abruptly by the counter, began to inspect some books and pamphlets lying there. This austere-looking personage held the books almost close to his face, as he turned over the leaves rapidly, and the Bard thought petulantly; then replaced them on the counter, and finally gave the whole a stern kind of shove out of the way, muttering as he rose, 'The trash of the day, I see!' then, without word or sign of recognition to the bookseller, rolled himself out of the shop. When he was gone, the Bard inquired of his friend who that bluff gentleman might be. The reply was, '_That bluff gentleman_ is the celebrated Dr. Johnson.'" This excited the desire of Mr. Williams to see him again, and he accordingly took another opportunity to meet him; and in order to have an excuse for speaking to him, presented three Grammars to him, and "solicited the favor of Dr. Johnson's advice which of them to choose, observing that the judgment of such a masterly writer must be the most valuable he could possibly obtain. Johnson either disregarded this really graceful compliment to him as a model author, or he was in an ungracious temper--no uncommon condition with him--for taking the volumes into his hands, he cast an equivocal look, between a glance and a scowl, at the humble stranger before him, hastily turned over the several title-pages, then surveyed him from head to foot, with an expression rather contemptuous than inquisitive; and, thrusting back the Grammars in his huge fist, rather _at_ the inquirer than toward him, delivered this oracular reply '_Either of them_ will do for _you_, young man.'"